Diskussionspapiere - Hannover Economic Papers (HEP)

Pure Theory of the Federal Funds Rate

Abstract: The effective federal funds rate is determined in a competitive interbank market, while the target federal funds rate represents a policy variable. This paper proposes a theory of the determination of the effective funds rate. According to the main result, the latter is a Lagrange multiplier that vanishes if excess reserves emerge. This is exactly what happened in the United States in September 2008. A final section considers interest on reserves.